Refactor sources modal

src/libs/source.js

@@ -0,0 +1,27 @@
+export function deleteSource(mapStyle, sourceId) {
+  const remainingSources = { ...mapStyle.sources}
+  delete remainingSources[sourceId]
+  const changedStyle = {
+    ...mapStyle,
+    sources: remainingSources
+  }
+  return changedStyle
+}
+
+
+export function addSource(mapStyle, sourceId, source) {
+  return changeSource(mapStyle, sourceId, source)
+}
+
+export function changeSource(mapStyle, sourceId, source) {
+  const changedSources = {
+    ...mapStyle.sources,
+    [sourceId]: source
+  }
+  const changedStyle = {
+    ...mapStyle,
+    sources: changedSources
+  }
+  return changedStyle
+}
+